Semi-blind frequency selection system and method for shortwave communication based on cw signal

Abstract

The invention discloses a shortwave communication semi-blind frequency selection system and a frequency selection method based on CW signals. Based on broadband digital multi-channel technology, passive perception of shortwave full-band interference energy is used, and the percentile method is used to set the energy threshold for each sub-band. The interference energy of the channel is judged to screen out the prior frequency, which provides the basis for the two-way detection of high-frequency CW communication, and then based on the short-wave radio station to actively detect the prior frequency, and further select the prior frequency according to the two-way detection results to select the optimal communication frequency , so as to provide real-time and reliable communication frequency for the complex and changeable short-wave communication environment, the reliability and real-time performance have been improved to a certain extent, at the same time, the equipment is simple, easy and fast to build, and it is suitable for the development and application of short-wave communication adaptive frequency selection technology is of great significance.

Description

technical field [0001] The invention relates to the technical field of shortwave communication frequency prediction, and more specifically, to a semi-blind frequency selection system and method for shortwave communication based on CW signals. Background technique [0002] Short-wave communication refers to a radio communication method with a frequency of 3-30MHz, also known as high-frequency communication. In order to make full use of the short-wave transmission characteristics, the frequency range in practical application of communication is 1.5-30MHz. Short-wave communication equipment is simple, low-cost, and easy to set up. At the same time, short-wave communication mainly relies on sky-wave propagation, which is strong invulnerability, unaffected by ground terrain, does not need relays and forwarding, and is not restricted by active relays and network hubs. The transmission power is small and the communication method is flexible. The sky wave can realize the communicati...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above technical problems, the present invention provides a semi-blind frequency selection system and frequency selection method for short-wave communication based on CW signals, which realizes the integration of detection and communication, and combines passive sensing and active detection to solve the problem of passing existing The frequency prediction model chooses the frequency for communication, which leads to the problem of low communication reliability and poor applicability

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